I am 66-1/2 years old, so "bulking up" is not my goal. I have been doing 3 sets of 5-10 reps/exercise, with a 1 minute rest between sets. Thus, I exercise to exhaustion with each set. I do each exercise very slow, methodical, and controlled (especially the eccentric contraction).
My question is, once I can complete 10 perfect reps in the first set, should I increase the weight then, or is it better to wait until I can do all 3 sets with a perfect 10?